http://llvm.org/bugs/show_bug.cgi?id=5980
Summary: Dangling PHI argument causing crashes
Product: libraries
Version: trunk
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: Common Code Generator Code
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Created an attachment (id=4016)
--> (http://llvm.org/bugs/attachment.cgi?id=4016)
Reduced test case
The attached test case causes ISel to produce a PHI instruction that refers to
an MBB not in the CFG
BB#11: derived from LLVM BB %bb886.i.preheader
Predecessors according to CFG: BB#4 BB#25
%reg1025<def> = PHI %reg1026, <BB#4>, %reg1024, <BB#25>, %reg1024,
<BB#22>
Successors according to CFG: BB#12
This looks innocent, but when -pre-regalloc-taildup later deletes BB#22, we
have a dangling pointer. Thing get worse from there.
Reproducible with
llc -verify-machineinstrs bugpoint-reduced-simplified.ll
llc -pre-regalloc-taildup -tail-dup-verify bugpoint-reduced-simplified.ll
llc -pre-regalloc-taildup bugpoint-reduced-simplified.ll
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